Cherry (Prunus serotina) features heartwood in reddish brown to deep red, with brown flecks, and will naturally darken with age.
Black walnut (juglans nigra) Canada and USA. Heartwood can range from a lighter pale brown to a dark chocolate brown
Wenge (millettia laurentii) Africa. Very dark brown in color with very close, straight grain and fine black veins. Wenge is